ST52 Seamless Pipe – DIN 1629 St52.0 (1.0421) Seamless Steel Pipe Supplier
ASC LLP, Mumbai, supplies ST52 seamless pipe to DIN 1629 St52.0 (material no. 1.0421) in DIN 2448 / EN 10220 sizes from 10.2 to 660 mm OD. Pipes are hot-finished or cold-drawn (NBK), with EN 10204 3.1 certificates. For cold-drawn precision hydraulic tubes to DIN 2391, see our ST52 seamless tubes.
What is ST52 Material?
“St” stands for Stahl (steel), and “52” for the old minimum tensile strength of about 52 kgf/mm² (≈ 510 MPa). ST52 is a carbon-manganese steel (C ≤ 0.22%, Mn ≤ 1.60%) with a minimum yield of about 355 MPa. That is roughly 50% stronger than ST37, while it remains weldable. For seamless pipe, ST52 is specified as DIN 1629 St52.0, the German standard for seamless circular unalloyed steel tubes with special requirements.
DIN 1629 has been withdrawn. The nearest current European grades are EN 10297-1 E355 (mechanical and general engineering tubes) and EN 10216-3 P355N (pressure tubes). Many buyers still order “DIN 1629 St52”.
Which ST52 Do You Need?
| Name buyers use | Standard & material no. | Product | Our page |
| ST52 seamless pipe | DIN 1629 St52.0, 1.0421 (now EN 10297-1 E355 / EN 10216-3 P355N) | Seamless pipe, 10.2 – 660 mm OD | This page |
| ST52 precision tube | DIN 2391 St52, 1.0580 (now EN 10305-1 E355) | Cold-drawn precision tube, 4 – 120 mm OD | ST52 seamless tubes |
| ST52 welded pipe / tube | DIN 2458 / DIN 2393 with St52 steel | ERW pipe and tube | ST52 welded pipes / tubes |
| ST52-3 bar & plate | DIN 17100 St52-3, 1.0570 (now EN 10025-2 S355J2) | Structural steel | ST52 round bars |
Delivery Conditions
- Hot-finished: hot-rolled seamless pipe, normalised where needed – the usual condition for larger sizes and heavier walls.
- Cold-drawn, normalised (NBK): cold-drawn to closer tolerances and then normalised. Tensile strength may be up to 10 MPa lower than hot-finished pipe.
Machined parts and hydraulic cylinders are often made from honed or skived ST52 pipe; for small-bore precision tube, DIN 2391 St52 is the right choice.
ST52 vs ST37 vs ST44 (DIN 1629)
- St37.0 (1.0254): 350 – 480 MPa tensile, 235 MPa yield – general low-pressure and structural pipe.
- St44.0 (1.0256): 420 – 550 MPa tensile, 275 MPa yield.
- St52.0 (1.0421): 500 – 650 MPa tensile, 355 MPa yield – the high-strength grade for mechanical and hydraulic use.
More: ST52 seamless pipes compared with other carbon steel grades.
DIN 1629 ST52 Seamless Pipe Specifications
| Item | Details |
| Standard | DIN 1629 (dimensions DIN 2448 / EN 10220) |
| Grade | St52.0, material no. 1.0421 |
| Type | Seamless – hot finished or cold drawn (NBK) |
| Outside diameter | 10.2 – 660 mm |
| Wall thickness | 1.6 – 65 mm |
| Length | Random 5 – 7 m, double random, fixed 6 m / 12 m or cut lengths |
| Ends | Plain or bevelled |
| Surface | Black varnish, bare or oiled; honed / skived ID on request |
| Testing | Tensile, flattening / ring tests, hydrostatic or NDT, dimensional check |
| Certificate | EN 10204 3.1; third-party inspection on request |
ST52 Chemical Composition (DIN 1629 St52.0, 1.0421)
| Element | DIN 1629 St52.0 (%) |
| Carbon (C) | 0.22 max. |
| Silicon (Si) | 0.55 max. |
| Manganese (Mn) | 1.60 max. |
| Phosphorus (P) | 0.040 max. |
| Sulphur (S) | 0.035 max. |
| Aluminium (Al, total) | 0.020 min. (nitrogen-fixing) |
Cast-analysis limits; product analysis allows Si 0.60% and Mn 1.70% max.
Mechanical Properties of ST52 Seamless Pipe
| Property | DIN 1629 St52.0 |
| Tensile strength Rm | 500 – 650 MPa |
| Yield strength ReH, min. – wall ≤ 16 mm | 355 MPa |
| Yield strength ReH, min. – wall 16 – 40 mm | 345 MPa |
| Yield strength ReH, min. – wall 40 – 65 mm | 335 MPa |
| Elongation A, min. | 21% longitudinal / 19% transverse |
Hardness is not specified by DIN 1629; values can be agreed on order.
ST52 Seamless Pipe Size & Weight Chart (DIN 2448 / EN 10220)
| OD (mm) | Standard wall (mm) | kg/m | Example heavy wall (mm) | kg/m |
| 21.3 | 2.0 | 0.95 | 3.2 | 1.43 |
| 26.9 | 2.3 | 1.40 | 4.0 | 2.26 |
| 33.7 | 2.6 | 1.99 | 4.5 | 3.24 |
| 42.4 | 2.6 | 2.55 | 5.0 | 4.61 |
| 48.3 | 2.6 | 2.93 | 5.0 | 5.34 |
| 60.3 | 2.9 | 4.10 | 6.3 | 8.39 |
| 76.1 | 2.9 | 5.23 | 7.1 | 12.08 |
| 88.9 | 3.2 | 6.76 | 8.0 | 15.96 |
| 114.3 | 3.6 | 9.83 | 8.8 | 22.89 |
| 139.7 | 4.0 | 13.39 | 10.0 | 31.98 |
| 168.3 | 4.5 | 18.18 | 11.0 | 42.67 |
| 219.1 | 6.3 | 33.06 | 12.5 | 63.68 |
| 273.0 | 6.3 | 41.43 | 12.5 | 80.30 |
| 323.9 | 7.1 | 55.47 | 12.5 | 95.99 |
Standard walls per DIN 2448; heavier walls are examples – any wall from 1.6 to 65 mm within the size range can be supplied. Weights: kg/m = 0.02466 × (OD − t) × t.
ST52 Physical Properties
| Property | Value (approx.) |
| Density | 7.85 g/cm³ |
| Modulus of elasticity | ≈ 210 GPa |
| Thermal conductivity | ≈ 45 – 50 W/m·K |
| Magnetic | Yes |
Applications of ST52 Seamless Pipe
- Hydraulics: cylinder barrels (honed or skived), high-pressure hydraulic lines and manifolds
- Mechanical engineering: shafts, rollers, bushings and machined parts
- Cranes and lifting equipment: booms, outriggers and structural members
- Heavy machinery: mining, construction and agricultural equipment frames
- General pressure pipework where the design code allows DIN 1629 / EN equivalents
Read more: ST52 tubes for hydraulic systems and benefits of ST52 seamless pipes.
Why Buy ST52 Seamless Pipe from ASC LLP?
- Certified material: DIN 1629 St52.0 or EN E355 / P355N with EN 10204 3.1 certificates.
- Full size range: 10.2 – 660 mm OD, standard and heavy walls, cut lengths.
- Complete ST52 range: ST52 precision tubes, ST52 welded pipes, ST52 round bars, plus ST35 tubes and precision seamless tubes.
- Export packing with end caps, bundled or boxed.
Send OD × wall, standard, condition, length and quantity to sales@amardeepsteel.com, call 022-67439130 or contact us. See also our carbon steel seamless pipes.
Frequently Asked Questions – ST52 Seamless Pipe
What is ST52 material?
ST52 is a carbon-manganese steel with about 0.22% carbon max., 1.60% manganese max. and a minimum yield strength of about 355 MPa. For seamless pipe it is specified as DIN 1629 St52.0 (material no. 1.0421).
What is the equivalent of ST52 seamless pipe?
DIN 1629 has been withdrawn. The nearest current grades are EN 10297-1 E355 for mechanical and engineering tubes and EN 10216-3 P355N for pressure tubes. ASTM A106 Grade C and A252 Grade 3 are similar but not identical.
What is the yield strength of ST52 pipe?
DIN 1629 St52.0 has a minimum yield strength of 355 MPa for walls up to 16 mm, 345 MPa for 16–40 mm and 335 MPa for 40–65 mm, with a tensile strength of 500–650 MPa.
What is the difference between ST52 pipe and ST52 tube?
ST52 seamless pipe is usually DIN 1629 St52.0 (1.0421) in pipe sizes up to 660 mm OD. ST52 precision tube is DIN 2391 St52 (1.0580), cold drawn to close tolerances in sizes up to about 120 mm OD for hydraulic lines.
What is the difference between ST52 and ST37?
ST52 has higher manganese and a minimum yield of about 355 MPa, compared with 235 MPa for ST37. ST52 is used where higher strength is needed in hydraulic, mechanical and structural applications.
Is ST52 the same as S355?
ST52-3 structural steel (DIN 17100) corresponds to EN 10025-2 S355J2. For seamless pipe, DIN 1629 St52.0 corresponds most closely to E355 or P355N. All have a nominal minimum yield of 355 MPa.
Global Reach
ASC LLP supplies seamless pipes, precision tubes and fittings to hydraulic, engineering and fabrication customers in the USA, Europe, the Middle East and Asia, with secure packing and full documentation. Buyers worldwide rely on our ST52 seamless pipes for certified material and traceability.
Countries We Export To
UNITED STATES, EUROPE, UK, UAE, SAUDI ARABIA, OMAN, KUWAIT, JORDAN, QATAR, INDONESIA, MALAYSIA, BRAZIL, SPAIN, ITALY, FRANCE, GERMANY, BAHRAIN, SRI LANKA, AZERBAIJAN, AUSTRALIA, AUSTRIA, PHILIPPINES, TURKEY, RUSSIA, IRAN, IRAQ, CANADA, KOREA, JAPAN, YEMEN, FINLAND, ZIMBABWE, HUNGARY, PORTUGAL, VIETNAM, MOROCCO, THAILAND, SOUTH AFRICA, MEXICO, SINGAPORE, GREECE, KUWAIT, POLAND, NEW ZEALAND, SWEDEN, SWITZERLAND, BELGIUM, BHUTAN, BANGLADESH, TAIWAN, ROMANIA, CAMBODIA, KAZAKHSTAN, AFGHANISTAN.
